Improvement in bags for phosphates



BENJAMIN It. CROASDALE, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN BAGS FOR PHOSPHATES, 84c.

Specification forming part of Letters Patent No. 124,254, dated March 5, 1872.

To all whom it may concern:

Be it known that I, BENJAMIN ROWLAND OROASDALE, of the city of Philadelphia, in the spilling of their contents, and owing to the porous nature of such bags there is loss by evaporation of the ammonia of guanos and by siftage of the ores. My invention consists of a bag made of textile fabric, so prepared that it is not attacked by the acids contained in guanos and phosphates or worn out by the attrition of the fragments of ores, so that much of the loss from evaporation of the ammonia of guanos and much, if not all, the siftage of the guanos, phosphates, ores, or other substances contained in the bags, is obviated.

In the preparation of the fabrics of which the bags are made I proceed as follows, to wit: I take a roll of burlap, canvas, cotton, or other textile fabric, and another roll of paperfelt or roofing-paper, either plain or saturated with a water or an acid-proof substance, such, for instance, as coal-tar. The two rolls are placed so that the felt, having received a coating of an adhesive substance, can be conveniently brought in contact with the textile fabric and the two united by pressure. I pour on the felt as it is drawn from its roller a quantity of some adhesive substance that will retain its elasticity, and for this purpose I have obtained good results from a mixture composed of about six parts, by weight, of crude turpentine; four parts, by weight, of crude rosin; two parts, by weight, of crude glue; four parts, by weight, of crude molasses 5 six parts, by weight, of crude water, and one part, by weight, of crude tallow. The felt is then immediately passed under a knife or scraper having a serrated or scalloped edge, the serrations or scallops being from one-eighth to one-sixteenth of an inch in depth and about one-fourth of an inch apart. By this means the adhesive substance is distributed evenly over the felt and scored in ridges or scalloped. The canvas, burlap, cotton, or other textile fabric from its roller is then led on the coated felt and the two are at once passed together between pressing rollers. If the paper-felt or roofing-paper employed is not saturated with coal-tar or other water or acid-proof substance before its application to the textile fabric then a water or an acid-proof coating should be applied to the outside of the felt. It is desirable in all cases, but not really necessary, that the united felt and fabric should be passed through a water-proof mixture, such as melted or dissolved rosin with tallow or oil, warm, an d then run between pressing-rollers. If desired, a second layer of the paper-felt or roofing-paper, either plain or saturated, as above mentioned, can be laid on top of the first-applied felt-coating, proceeding in the same in anner as is above described.

I claim- I A bag formed of burlap, canvas, cotton, or other textile fabric, coated with paper-felt or roofingpaper, (plain or saturated with an acid or water-proof substance,) in one or two layers, for use in the transportation of guanos, phosphates, and mineral ores, substantially as set forth.

BENJ. It. OROASDALE.

Witnesses:

W. W. DOUGHERTY, J. M. DOUGHERTY. 

